ZEBINIDAE COAN, 1964

Criscione, Francesco, Ponder, Winston Frank, Köhler, Frank, Takano, Tsuyoshi & Kano, Yasunori, 2017, A molecular phylogeny of Rissoidae (Caenogastropoda: Rissooidea) allows testing the diagnostic utility of morphological traits, Zoological Journal of the Linnean Society 179 (1), pp. 23-40 : 34

FAMILY ZEBINIDAE COAN, 1964

This name has been treated as a synonym of Rissoininae ever since its introduction. They are similar to rissoinids in general shell morphology and anatomy but differ in having a shorter posterior stomach chamber (Supporting Information, Fig. S1C) and in having a thin operculum which lacks an opercular peg ( Fig. 3D ). Their shell aperture differs in having the inner lip lacking an anterior notch and has a simple, rounded anterior end or, as seen most noticeably in species of the genus Stosicia , an indistinct to distinct anterior canal may be present (e.g. Ponder, 1985a, fig. 142A, E) that is formed differently from the angulation in rissoinids.

In contrast to rissoinids, there is no evidence for anything other than a microphagous diet in zebinids, with all the examined taxa having a short stomach ( Marcus & Marcus, 1964; Ponder, 1985a).

Zebinids and rissoinids have had long independent histories as there are records of both groups from the Jurassic ( Ponder, 1985a; Conti et al., 1993; Kaim, 2004).

Figures

Figure 3. Maximum-likelihood-based ancestral character state reconstruction for anatomical characters mapped on the Bayesian consensus tree of Fig. 1. A, shell anterior canal. B, duplicated peristome. C, shell inner organic layer. D, opercular peg. E, pallial tentacles. F, metapodial tentacles. G, posterior mucous gland. H, basal cusps on rachidian tooth. Taxa for which anatomical information was not available have been excluded from the tree. Branches with BPP support values lower than 90% are shown as collapsed. A likelihood of state at each node lower than 1% is omitted.